Portable fan



FIG. 1 is a perspective view of the fan according to the present design;

FIG. 2 is a top view of the present design;

FIG. 3 is a front view of the present design; and,

FIG. 4 is a right side plan view of the present design and illustrating in phantom a displaceable stand support, a corresponding left side plan view being a mirror image thereof.

The broken line showing of environmental structure is for illustrative purposes only and forms no part of the claimed design. 

I claim the ornamental design for a portable fan, as shown and described. 